Pakanohida, looks like a plan! I'll tell you what happened to me I had 6 mandala circles, and getting from one to the next became an issue. To only have one entrance to each circles means walking in and out, or in, out and across (Plus around the pond) and it's a lot of walking. I ended up putting two entrances to one circle.
Deer might not attempt your bramble fence, but rabbits will be thrilled with some nice thick overgrowth over their heads. They love being under those, and they can dash from lovely vegetable to their hiding places, to lovely vegetable. I used to watch them run back and forth all day from the wild berries that grow here. We also cleared some new roads, and piled the brush we cleared away, and they also love those piles. Needless to say, this year we have more rabbits than I've ever seen. And now the coyotes are coming in to get them, also the bobcat and the buzzards.
You might have read my previous remarks about my mandalas that became impractical, and I switched back to rows that I can mow, move among easily and keep cleared so that the mice, voles, rabbits have to run a long distance in an open space, so they tend to go the other way now. I have one mandala remaining, 30 feet across, 90 feet around that I keep in solidarity with the idea, but I'm about to spin it around in an undala kind of shape, two half circles back to back so I can mow and move in and out of the circle more freely. I also had trouble with the center circle of the mandala not being big enough to hold the tools I was working with, a wheelbarrow or tarp and me. I was always tripping over everything.
You know, fall is the time of year a lot of seeds go on sale, usually half price, so if you can stock up now it's a good idea.
"Life flows on within you and without you"...George Harrison
Coastal California, USA, Mediterranean climate - no summer rain, a little frost mid-winter